Lock.



' R. c. LEWIS.

LOCK. APPLICATION FILED JULY 2, 19I'B.

1,296,538. Patented Mz u'. 4,1919.

INVENTOR UNITED STATES PATENT OFFICE.

ROLLIN C. LEWIS, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOWNE MANUFACTURING COMPANY, OF STAMFORD, CONNECTICUT.

LOCK.

1 citizen of the United States, and a resident of Stamford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Locks; and- I do hereby declare the following to be a full, clear, and exact description of the invention, such as'will enable others skilled in the art to which it appertains to make and use the same. 1 2

This invention relates to an improvement in looks and particularly to the means for securing the curb of a combination lock to the lock case, the object being to provide a simple and eflective connecting means be tween the curb and casing whereby the curb and th tumblers properly nested therein, can be readily and quicklyv secured in place against the possibility of accidental displacement.

In the accompanying drawings, Figure 1 is a view in elevation of a lock embodying my invention; Fig. 2 is a view in section; Fig. 3 is a view in perspective of the lock case, the curb being removed, and Fig. 4 is a view of the curb showing the tumblers nested therein.

1 represents the case of a combination lock, and is designed for attachment to the inner face of a safe or vault door, so that the cover plate thereof will be accessible only when the door is open.

The case 1 is provided with a circular opening in its rear face, which opening is surrounded by the raised offset 6, which forms a seat for the cover plate 7. This offset or seat has two diametrically located slots 8 communicating with the said opening, to receive the diametrically disposed lugs or wings 9 formed on, or struck up from the inwardly projecting circular flange 10 of the curb 12. This flange 10 is preferably formed by bending or turning the periphery of the curb 12 which is permanently secured by brazing or'in any other manner to the inner face of the cover plate 7, and is of a diameter to snugly fit within the opening in the casing 1, so that when the cover plate is applied to thelock case, it and the curb carried thereby will be free to turn a limited distance but will be restrained against lateral movement.

The inner face of the oflset or seat 6 is Specification of Letters Patent.

Patented Mar. 4, 1919.

Application filed July 2, 1918. Serial No. 243,066.

cut away adjacent each slot to form locking flanges 13 to be engaged by the wings 9, on the curb so thatwhen the wings are entered in the slots 8, the cover plate and the curb can be given a part rotation so as to carry the wings under the flange 13 the slots, wings and flanges forming in effect a bayonet joint which locks the curb against outward movement.

To lock the cover plate 7 against accidental rotation and consequent displacement, I

provide a spring plunger 14: mounted in the lock case at one side of the'latter as shown in Fig. 2. This plunger is mounted adjacent to its two ends in bearings formed in the lock case and is provided with the shoulder 15 which limits its outward movement, and against which the spring 16 bears, the spring tending to normally hold the plun ger projected. When the plunger is in its projected or normal position, its outer or rear end projects through the offset seat 6 and enters a hole 17 in the cover 7, and as the hole 17 is eccentric to the axis of the cover plate, the latter will be held by the plunger against turning movement. If desired the cover plate may have two holes 17 one of which will receive the end of the plunger when the cover plate is applied and turned to locking position.

To release the cover plate, the plunger is forced inwardly by pressure applied to the exposed end thereof and the cover plate turned until the lugs 9 thereon register with the slots in the seat 6. In applying the cover plate, it bears against the plunger and forces it in and holds it retracted until it alines with one of the holes 17 during the turning of the cover plate. It will then be pushed by its spring into the hole and thus lock the cover plate in position.

The curb 12 is provided centrally with the fixed-sleeve 18 on which the tumblers 19 are nested and mounted to rotate, the tumblers being held in place on the sleeve by a split ring secured in the groove 20 at the front or'free end of the sleeve. The lock spindle enters the sleeve and operates the tumblers in the well known manner.

By simply pushing in on the plunger and 105 then partly rotating the cover plate, the latter and its curb carrying the tumbler may be removed for changing or reassembling the tumblers.

It is evident that many slight changes might be resorted to in the'relative arrangement of parts shown and described without departing'from the spirit and scope of my invention. Hence I would have it understood that I do not wish to confine myself to the exact construction and arrangement of parts shown and described, but,

Having fully described my invent-ion what I claim as new and desire to secure by Letters-Patent, is':

1. In a lock, the combination of a lock case open at the rear and provided with a pluralityof slots, communicating with said opening, and a locking flange on the lock case HChELGBIlt each slot, a cover plate haw ing an inwardly projecting circular flange adapted to make close fit with the opening in the lock case and provided with a plurality of outwardly projecting lugs adapted toenter the slots in the lock case and by a turnin movement of the cover plate be carried be ind the locking flanges on the lock case for holding the cover plate against outward displacement and a spring pressed plunger carried by the lock case transversely of the latter and projecting from the rear face of the lock case and in a position to be engaged by the cover plate and enter a hole in the latter for preventing rotation of the cover plate, the free end of'said plunger beto enter the slots in the lock ease and by a turnin movement of the cover plate be car: r-ied be ind the flanges on the lock case for holding the cover plate and curb against outward displacement, and a spring pressed plunger carried by the lock case and pro,- jecting from the rear face of the latter to be engaged by the cover plate and to enter the plunger opening in the coverplate ,for preventing rotation of the latter, the free end of said plunger being exposed and accessible at the rear of the lock case. i

In testimony whereof, I have signed this specifieationin the presence of two subscribe ing witnesses.

V ROLLIN C. LEWIS.

Witnesses:

STUART B. AVERY,

A. HANN.

001119! at this pate may-b o a five cents a h. by s dre ins th a m ssiomr 0 Ba ent Washington, D. 63 

